Fix genEventing.py to generate correct EventEnabled functions

[sywhang]

Fix #44383.

Output (clretwallmain.h) before the change:

inline BOOL EventEnabledGCStart_V1() {return EventPipeEventEnabledGCStart_V1();}

inline BOOL EventEnabledGCStart_V2() {return EventPipeEventEnabledGCStart_V2();}

inline BOOL EventEnabledGCEnd() {return EventPipeEventEnabledGCEnd();}

Output (clretwallmain.h) after the change:

inline BOOL EventEnabledGCStart_V1() {return EventPipeEventEnabledGCStart_V1()|| EventXplatEnabledGCStart_V1();}

inline BOOL EventEnabledGCStart_V2() {return EventPipeEventEnabledGCStart_V2()|| EventXplatEnabledGCStart_V2();}

inline BOOL EventEnabledGCEnd() {return EventPipeEventEnabledGCEnd()|| EventXplatEnabledGCEnd();}

[sywhang]

/backport to release/5.0

[github-actions]

Started backporting to release/5.0: https://github.com/dotnet/runtime/actions/runs/354947277